Implement Comparable.

git-svn-id: https://samskivert.googlecode.com/svn/trunk@1057 6335cc39-0255-0410-8fd6-9bcaacd3b74c

projects/samskivert/src/java/com/samskivert/util/IntTuple.java

@@ -1,5 +1,5 @@
 //
-// $Id: IntTuple.java,v 1.2 2002/11/30 04:09:13 mdb Exp $
+// $Id: IntTuple.java,v 1.3 2003/02/18 18:22:50 mdb Exp $
 //
 // samskivert library - useful routines for java programs
 // Copyright (C) 2001 Michael Bayne
@@ -24,6 +24,7 @@ package com.samskivert.util;
  * A simple object that holds a reference to two ints.
  */
 public class IntTuple
+    implements Comparable
 {
     /** The left int. */
     public int left;
@@ -51,6 +52,17 @@ public class IntTuple
         return left ^ right;
     }
 
+    // documentation inherited from interface
+    public int compareTo (Object o)
+    {
+        if (o instanceof IntTuple) {
+            IntTuple ot = (IntTuple)o;
+            return (left == ot.left) ? (right - ot.right) : (left - ot.left);
+        } else {
+            return -1;
+        }
+    }
+
     /**
      * A tuple is equal to another tuple if the left and right elements
      * are equal to the left and right elements (respectively) of the